Check out our PSUs 101 article to learn more about PSU protection features.
|OCP (Cold @ 26°C)||12V: 99.6A (141.71%), 12.102V|
5V: 27.3A (136.5%), 5.019V
3.3V: 26.8A (134%), 3.338V
5VSB: 6.3A (210%), 4.971V
|OCP (Hot @ 43°C)||12V: 83.2A (118.86%), 12.033V|
5V: 27.2A (136%), 4.990V
3.3V: 26.6A (133%), 3.314V
5VSB: 6.2A (206.67%), 4.952V
|OPP (Cold @ 27°C)||1200.61W (142.93%)|
|OPP (Hot @ 43°C)||1001.06W (119.17%)|
|OTP||✓ (147°C @ secondary side)|
|SCP||12V to Earth: ✓|
5V to Earth: ✓
3.3V to Earth: ✓
5VSB to Earth: ✓
-12V to Earth: ✓
|PWR_OK||Accurate but lower than 16ms|
Inrush: NTC Thermistor & Bypass relay
The OCP triggering points at low temperatures are higher than usual, but this doesn't affect the PSU's operation. With increased temperatures, OCP at 12V drops notably lower, protecting the platform more effectively. The same goes for OPP. At low temperatures, it is pretty high, while with increased ambient, it drops 200W lower. We don't usually see so much difference in OCP and OPP under cold and hot conditions.
DC Power Sequencing
According to Intel’s most recent Power Supply Design Guide (revision 1.4), the +12V and 5V outputs must be equal to or greater than the 3.3V rail at all times. Unfortunately, Intel doesn't mention why it is so important to always keep the 3.3V rail's voltage lower than the levels of the other two outputs.
No problems here since the 3.3V rail is always lower than the other two.
Cross Load Tests
To generate the following charts, we set our loaders to auto mode through custom-made software before trying more than 25,000 possible load combinations with the +12V, 5V, and 3.3V rails. The deviations in each of the charts below are calculated by taking the nominal values of the rails (12V, 5V, and 3.3V) as point zero. The ambient temperature during testing was between 30 to 32 degrees Celsius (86 to 89.6 degrees Fahrenheit).
Load Regulation Charts
The lower the power supply's ripple, the more stable the system will be and less stress will also be applied to its components.
We apply a half-load for 10 minutes with the PSU's top cover and cooling fan removed before taking photos with a modified Fluke Ti480 PRO camera able to deliver an IR resolution of 640x480 (307,200 pixels).
Without active cooling, the boost diode gets hot, very hot. This is strange since it is firmly secured on the APFC heat sink, using a thermal pad for better contact. Nonetheless, this diode can handle 8A with 125 degrees Celsius junction temperature.
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